KR100376998B1 - Hydrostatic bearing motor - Google Patents

Abstract

The present invention discloses a hydrostatic bearing motor.

The present invention provides a rotor comprising a case and a magnet provided on an inner side surface of the case; A rotating shaft having one end fixed to a lower surface of the case center of the rotor and having a thrust plate integrally formed at a lower end thereof; Located in the lower part of the rotor, a stator composed of a core and a coil wound around the core is fixedly installed on the center outer circumferential surface, and the upper and lower inner circumferential surfaces are slid to support the upper and lower outer circumferential surfaces of the rotating shaft. A housing in which one air space portion is formed; A holder provided on a lower inner side surface of the housing and forming a second air space portion between the thrust plate of the rotary shaft and the second air space for securing a load bearing capability in the thrust direction; Air supply means for supplying air onto the first and second air spaces; and includes a conventional ball bearing support method by supporting a rotation shaft supporting method in a radial and thrust direction through air, that is, through an air membrane. It is possible to obtain an increased degree of rotation compared to the support method through the oil film by the oil.

Therefore, in recent years, there is an advantage that can be appropriately used in the device for reproducing the recording medium that requires high speed.

Description

Hydrostatic bearing motor

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor, and more particularly, to a hydrostatic bearing motor employing a hydrostatic bearing support system for supporting a shaft through a fluid, for example, air.

In general, a motor is not only classified into a rotating shaft type and a fixed shaft type according to the shaft support method, but also classified into a rolling bearing support method and a sliding bearing support method according to the support method of the driving unit.

Rolling bearings are generally designed to support shafts through one or more ball bearings, and inexpensive ball bearings provide cost savings and the ball between the inner and outer rings has great rigidity. It has the advantage that it can be used for a long time.

On the other hand, there is a problem in that high precision rotation accuracy cannot be obtained, and it is applicable to a certain low speed rotation, but there is a problem in that it is difficult to apply to products requiring high speed rotation.

That is, when applied to a motor of a recording medium that requires high-speed rotation, not only severe vibration is caused by the gap between the ball and the inner and outer rings, but also a noise is caused.

On the other hand, the sliding bearing support method is to support the shaft by forming a metal bearing containing fluid or an air film through oil and air to support the shaft. While there is a disadvantage of unit price increase compared to the rolling support method, it can maintain a high degree of rotation, and in recent years, a recording medium that requires a high speed rotation such as a hard disk drive (HDD) or a CD-ROM ( It is widely adopted in the motor of the body.

1 shows a motor employing a general sliding bearing support method.

This is roughly divided into a rotating shaft 10, a rotor 20 and a housing 30.

The rotor 20 has a case 21 in which an upper end of the rotating shaft 10 is coupled to a center lower surface thereof, and a magnet 22 is fixedly installed at an inner side of the case 21.

As described above, the rotating shaft 10 is fixed to the case 21 of the rotor 20 and extends therefrom, and a thrust plate 11 is integrally provided at the lower end thereof.

The housing 30 has a stator 40 formed of a core 41 for generating a rotating electromagnetic force and a coil 42 wound thereon, together with the magnet 22 of the rotor 20 on the outer surface. As the center surface, the rotary shaft 10 is inserted to maintain a predetermined gap.

An oil is interposed between the housing 30 and the clearance between the rotary shaft 10 to secure the load supporting ability in the radial direction.

On the other hand, the lower end of the housing 30 is inserted into the thrust plate 11 integrally provided at the lower end of the rotating shaft 10 and a holder (50) is also inserted to maintain a predetermined gap, the oil is also a gap between these This intervenes.

The motor having such a configuration, the rotary shaft 10 and the rotor 20 is rotated at a high speed through the rotating electromagnetic force between the rotor 20 and the stator 40, the housing 30 in the process of rotating the rotary shaft 10 ) And the oil interposed between the rotary shaft 10 and the oil interposed between the thrust plate 11 and the holder 50 of the rotary shaft 10 to rotate at a high speed while ensuring a load supporting ability in the radial and thrust directions. Will be.

However, in such a conventional motor, since there is a limit to the rotation of the rotating shaft 10 at a high speed, there is a problem in that it is difficult to be used in a device that needs to gradually increase in recent years.

This is because not only the content of the oil itself is limited, but also the fear of oil leakage and rapid consumption of the oil occurs at high speed rotation.

The present invention was created in order to solve the problems of the conventional motor, it is possible to generate a constant static pressure to be able to stably perform high-speed rotation of the rotating shaft can be used in equipment requiring high speed fluid hydrostatic bearing motor The purpose is to provide.

1 is a cross-sectional view of a typical motor,

2 is a cross-sectional view of a hydrostatic bearing motor according to the present invention.

<Description of the symbols for the main parts of the drawings>

100: rotor 110: case

120: magnet 200: rotation axis

210: thrust plate

300: housing 310410: first and second air spaces

311,312: Upper and lower bearing space 313,412: Air passage

411: thrust bearing space 500: air supply means

510: pump 520: controller

530: valve 600: stator

610: core 620: coil

In order to achieve the above object, the hydrostatic bearing motor according to the present invention includes a case and a rotor made of a magnet provided on an inner surface of the case; A rotating shaft having one end fixed to a lower surface of the case center of the rotor and having a thrust plate integrally formed at a lower end thereof; Located in the lower part of the rotor, a stator composed of a core and a coil wound around the core is fixedly installed on the center outer circumferential surface, and the upper and lower outer circumferential surfaces of the rotation shaft are slid to the center upper and lower inner circumferential surfaces. A housing in which the first air space is formed; A holder provided on a lower inner surface of the housing and forming a second air space portion between the thrust plate of the rotary shaft and the second air space for securing a load bearing capability in the thrust direction; And air supply means for supplying air onto the first and second air spaces.

One preferred feature of the present invention, the first air space, the upper and lower bearing spaces are formed in a predetermined depth on the upper and lower inner surfaces of the housing corresponding to the upper and lower outer peripheral surfaces of the rotating shaft, and the upper and lower It consists of a plurality of air passages for guiding the air supplied through the air supply means to the bearing space.

According to another preferred aspect of the present invention, the second air space portion includes a thrust bearing space portion formed at a predetermined depth on an upper surface of the holder corresponding to the thrust plate of the rotation shaft, and through the air supply means into the thrust bearing space portion. And a plurality of air passages for guiding the air to be supplied.

Another preferred feature of the invention is that the air supply means includes a pump, a controller for controlling the air pressure supplied from the pump, and the air controlled by the controller to the first and second air spaces. It consists of the valve to supply.

Hereinafter, a preferred embodiment of a motor according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a cross-sectional view of a hydrostatic bearing motor according to the present invention.

As shown therein, the motor according to the present invention is roughly classified into a rotor (100), a rotating shaft (200), a housing (300), a holder (400), and an air supply means (500).

The rotor 100 includes a case 110 and a magnet 120 fixed to an inner side surface of the case 110.

The rotary shaft 200 rotates at high speed together with the rotor 100, and an upper end thereof is coupled to a center lower surface of the case 110 of the rotor 100, and a thrust plate 210 is integrally provided at a lower end thereof.

The housing 300 is located below the rotor 100. The upper outer surface includes a core 610 and a coil 620 wound thereon to generate a rotating electromagnetic force together with the rotor 100 described above. The stator 600 is fixedly installed.

In addition, the first air space 310 is formed on the upper and lower inner peripheral surfaces of the center into which the rotary shaft 200 is inserted to slide the upper and lower outer peripheral surfaces of the rotary shaft 200 through air.

The first air space 310 includes upper and lower bearing spaces 311 and 312 formed at predetermined depths on the upper and lower inner peripheral surfaces of the housing 300 corresponding to the upper and lower outer peripheral surfaces of the rotating shaft 200. It consists of a plurality of air passages 313 for guiding the air supplied from the air supply means 500 to the upper and lower bearing spaces 311 and 312.

Holder 400 is inserted into the lower inner surface of the housing 300, the second air space for securing the load bearing capacity in the thrust direction between the thrust plate 210 of the rotating shaft 200 described above 410 is formed.

The second air space 410 includes a thrust bearing space 411 formed at a predetermined depth on an upper surface of the holder 400 corresponding to the thrust plate 210 of the rotation shaft 200, and the thrust bearing space portion. 411 is composed of a plurality of air passages (412) for guiding the air supplied through the air supply means (500).

The air supply unit 500 is provided to supply air of a predetermined pressure into the first and second air spaces 310 and 410 described above, and includes a pump 510 for supplying air at a predetermined pressure, and the pump ( A controller 520 for controlling the pressure of the air supplied by the 510 and a valve 530 for distributing and supplying the air properly controlled by the controller 520 to the respective air passages 313 and 412. .

The hydrostatic bearing motor according to the present invention having such a configuration is provided between the rotor 100 and the stator 600 in a state in which air is supplied to the first and second air spaces 310 and 410 through the air supply means 500. The rotating shaft 200 and the rotor 100 are rotated together at high speed through the rotating electromagnetic force generated by the.

At this time, the upper and lower outer peripheral surfaces of the rotating shaft 200 are supported by the air guided to the upper and lower bearing spaces 311 and 312 on the first air space 310 in the radial direction through the air membrane, and are integrated into the lower end thereof. It is supported in the thrust direction by the air guided to the thrust plate 210 and the thrust bearing space 411 on the second air space 410 provided.

Therefore, the subject of the present invention can be more appropriately used in a device that requires a high speed by being able to obtain a more stable rotational degree than the fluid dynamic bearing support method by the oil film even when rotated at a very high speed.

On the other hand, the above-described embodiment is merely described one preferred embodiment of the present invention, the scope of application of the present invention is not limited to such, and can be changed as appropriate within the scope of the same idea. For example, the shape and structure of each component shown in the embodiment of the present invention can be modified.

As described above, according to the hydrostatic bearing motor according to the present invention, a method of supporting a rotating shaft through air, i.e., in a radial and thrust direction through an air membrane is supported by a conventional ball bearing support method or an oil membrane by oil. Compared with this, an increased degree of rotation can be obtained.

Therefore, in recent years, there is an advantage that can be appropriately used in the device for reproducing the recording medium that requires high speed.

Claims (4)

A rotor comprising a case and a magnet provided on an inner side of the case; A rotating shaft having one end fixed to a lower surface of the case center of the rotor and having a thrust plate integrally formed at a lower end thereof; Located in the lower part of the rotor, a stator composed of a core and a coil wound around the core is fixedly installed on the center outer circumferential surface, and the upper and lower outer circumferential surfaces of the rotation shaft are slid to the center upper and lower inner circumferential surfaces. A housing in which the first air space is formed; A holder provided on a lower inner surface of the housing and forming a second air space portion between the thrust plate of the rotary shaft and the second air space for securing a load bearing capability in the thrust direction; And a air supply means for supplying air onto the first and second air spaces. The method of claim 1, The first air space, the upper and lower bearing spaces are formed in a predetermined depth on the upper and lower inner surfaces of the housing corresponding to the upper and lower outer peripheral surfaces of the rotating shaft, and the upper and lower bearing spaces through air supply means. A hydrostatic bearing motor, comprising a plurality of air passages for guiding the supplied air. The method of claim 1, The second air space portion includes a thrust bearing space portion formed at a predetermined depth on an upper surface of the holder corresponding to the thrust plate of the rotation shaft, and a plurality of air guides the air supplied through the air supply means into the thrust bearing space portion. Hydrostatic bearing motor, characterized in that consisting of passages. The method of claim 1, The air supply means includes a pump, a controller for controlling the air pressure supplied from the pump, and a valve for supplying air controlled by the controller to the first and second air spaces. Constant pressure bearing motor.